Gas-engine.



. R. W. MUIR.

GAS ENGINE.

APPLICATION FILED nic. 1e. 1912.

Patented May 15, 1917.

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HTORJYE YJ R. W. MUIR.

GAS ENGINE.

APPLlcAloN FILED 056.16.1912.

Patented; May15,1917.

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ROBERT W. MUIR., OF HUNTER., NORTH DAKOTA.

GAS-ENGINE.

Specication of Letters Patent.

" Patented May 15, 1917..

Application led December 16, 1912. Serial No. 737,056.

To all whom t may concern:

Be it known that I, ROBERT W. Mum, a citizen of the United States,resident of Hunter, in the county of Cass, State of North Dakota, haveinvented certain new and useful Improvements in GasEngines, of which thefollowing is a specification.

My invention relates to" internal combustion engines of the four-cycletype and the object of the invention is to reduce the number of partsusually required in the operation of an engine of this type and therebycheapen the manufacture of the engine.

A. further object is to increase the etliciency of the engine byproviding means for applying the power throughout the greater proportionof the stroke.

A further object is to provide an engine in which the usual noisyreciprocating valves will be omitted, and thereby the engine will berendered more durable and will operate with less noise than engines ofthis type as usually constructed.

Other objects of the invention will appear from the following detaileddescription.

The invention consists generally in various constructions andcombinations, all as hereinafter described and particularly pointed outin 'the ciaims.

ln the accompanying drawings forming part of this specification,

Figure 1 is a vertical sectional view through a gas engine cylinderembodying my invention, the piston being illustrated at the end of thecompression stroke or at the 'beginning cf the explosion stroke,

Fig. 2 is a similar view taken on a section line at right anglessubstantially to the section line of Fig. 1, illustrating the piston theend of the explosion stroke or the beginning of the scavenging stroke,

Fig. 3 is a sectional view on the line mof Fig. 1, o

Fig. 4 is a sectional view on the line y-y of Fig. 2,

Figs. 5, 6, 7 and 8 are diagrammatic views illustrating the successivesteps or strokes of the engine, beginning with the suction stroke forthe first quarter, the compression stroke for the second quarter, theexplosion stroke for the third quarter, and the scavengingor exhauststroke for the fourth quarter,

Fig. 9 is a detail sectional view of the rotating valve, showing theposition of the lugs thereon and the position of the valve during theexplosion stroke, i

Fig. l() is a similar view, illustrating the movement of the valveduring the exhaust or scavenging stroke,

Fig. 11 is a detail view illustrating the means for operating therotating valve from the rocking end of the connecting rod.

In the drawings, l2 represents the crank case, 3 a cylinder and 4 thecrank shaft having a connecting rod 5. 6 represents the gas intake portin the walls of the cylinder, connected by suitable means with acarbureter and a source of gas supply, not shown. 'Z' is an exhaust ductprovided in the walls of the cylinder. rlhe cylinder is also preferablyprovided with a supplemental exhaust opening or port 8. 9 is a pistonhaving bearings at 10 for a cross head 11 on the end of the connectingrod. The piston is also provided with iongitudinal ducts or passages 12and 13 arranged to register respectively with the intake and exhaustports 6 and 7. These passages 12 and 13 extend preferably from end toend of 'the piston so that they will be in communication with the portsin the walls of the cylinder throughout the stroke of the piston, thecommunication of the ducts with the combustion chamber of the cylinderbeing regulated or controlled by the rotary valve, as will hereinafterappear.

The inner end of the vpiston is provided with horizontal ducts 14 and 15extending around a portion of the circumference of the piston andseparated by a wall 16. The duct 14 communicates with the intake passage12 and the duct 15 with the exhaust passage 13. Upon the head of thepiston 1 arrange a flat valve disk 17 adapted to rotate in a guide 18and tting snugly on the head of the piston. This valve is imperforate,except for a single port 19 which is adapted to register'successivelywith the inlet and exhaust passages and with the ducts 14E and 15, asthe valve is revolved.

Evidently if the valve starts from the position shown in Fig. 5 andrevolves toward the right, the intake port will remain in communicationthrough the duct 14: with the combustion chamber of the cylinder duringthe first quarter of the revolution of the valve, and the intake at thebeginning of the vsecond quarter of the revolution will be closed, asindicated in the diagrammatic view (Fig. 6), and both intake and exhaustports will remain closed during the compression and explosion strokes.On the last quarter of the revolution of the valve its port 19 willregister with the exhaust passage and the duct and the burnt gases willescape through the exhaust opening. When the piston is near the end ofthe power stroke the auxiliary exhaust opening 8 will be uncovered andthe pressure in the cylinder will fall to' that of the atmosphere. A lipor flange is preferably provided on the edge of the valve and is adaptedto close the auxiliary exhaust when the piston is at the lower end ofits suction stroke,

arms 21 and 22 are arranged to straddle.

these pins and lugs successively lin the rocking movement of thek cross'head 11 in the reciprocation of the piston and connecting i. rod. Thepins 23 are considerably longer than the lugs 24 and when the short arm21 engages one of the long pins 23 the rocking of the cross head willimpart a rotary movement to the valve commensurate with the stroke ofthe connecting rod and the length of the arm 21. As the connecting rodswings to and fro with the revolution of the crankshaft the arms 21 and22 are rocked beneathvthe rotary valve and engage the lingersI 23andlugs 24: respectively and sucmovement of the valve7 and the lugsor'pins cessively to impart a rotary movement to the valve. Thisengagement of the arms and the lingers and lugs is clearly-shown inFigs. 9 and 10, wherein it will be noted that when one arm is performingits function Iand rotating the valve a quarter turn, the other arm isin' engagement with a lug ornger to prevent overthrow or excess of t areso disposed with respect to one another and the center of the valve andthe rocking arms that when one arm engages its pin or lug the other armis in position with respect to its finger or lug to allow the freerotation of the valve.

rately timed withv the stroke of the piston to admit a fresh charge tothe cylinder and cut 0H the intake and open the exhaust at the* propertime to discharge the burnt gases from the cylinder. As the piston goesdown on its intake stroke the swing of the connecting rod will move thevalve so that its port will register with the gas intake and remain incommunication with said intake to the end of the stroke. The continuedrotation ofthe valve will then close the intake on the' compressionstroke or second quarter The movement ofv the valve will thus becontinuous and accuand will remain closed during the third quarter asthe piston moves down on the power stroke. When near the end of thepower stroke the auxiliary exhaust will be uncovered and the pressure ofburnt gases in the cylinder will be relieved, and when the piston startsback on the scavenging stroke the port in the valve will register withthe exhaust and continue in register therewith to the end of the fourthquarter, when the valve will' again be operated to communicate with theintake port and repeat the operation.

I have in this engine eliminated all reciprocating valves and therebygreatly reduced the noise of the engine and the expense of maintenance,and have also dispenseel with numerous parts` necessary to thereciprocating valve construction.

In various ways the details of construc' tion,' such as the manner ofrotating the .valve from the'rocking end of the connect- ,ing rod, maybe modified and still be with- 4`inthe scope of my invention.

I claim as my invention 1. An internal combustion engine of thefour-cycle type comprising a cylinder having inlet and exhaust ports, apiston having passages extending substantially from end to end thereofand communicating continuously with said ports respectively throughoutthe stroke of. said piston, a connecting rod, a valve mounted to revolveon the head ofsaid piston and having a port arranged to registersuccessively with said inlet and exhaust ports, and means actuated bythe rocking of said connecting rod for operating said valve.

2. An internal combustion engine of the four-cycle type comprising acylinder having inlet and exhaust .ports and an auxiliary exhaust port,a piston having passages communicating with said ports respectively7 aconnecting rod for said piston, a valve mounted to revolve on the headof said piston and having a port arranged to communicate successivelywith the main exhaust port and said inlet port, said valve having a lip-or flange that is adapted to cover said auxiliary exhaust port whensaid piston is at a predellllU termined point in its suction stroke, andi means actuated by the rocking of said connecting rod for operatingsaid valve.

3. An internal combustion engine of the four-cycle type comprising acylinder having inlet and exhaust ports, a piston having passagestherein communicating respectively with said ports, a valve lmounted torevolve on the head of said piston and having a port arranged tocommunicate successively with said passages, a connecting rod for saidpiston, and arms mounted on said connecting rod and having means forengaging and operating said valve during vthe rocking movement of saidrod. l

4. An internal combustion engine comprisnaaaase ton and having a portarranged to communicate successively With said'passages, a connectingrod pivotally connected with said piston andhaving forked arms `ofvarying length thereon, said valve having depending lugs and fingers ofvarying length in the path of said forked arms, for the purposespecifed.

5. An internal combustion engine comprlsing a' cylinder having inlet andexhaust ports, a piston having passages communicating with said portsrespectively, a valve mounted to revolve'on the head of said piston andhaving a port arranged to communicate successively With said passages, aconnecting rod pivotally connected With said piston and having forkedarms of varying c length thereon, said valve having depending -lugs andfingers-of varying length in the path of said forked arms, one of saidarms engaging a linger of said valve to actuate the same While the'otherarm engages a lug of said valve to prevent overthrow thereof, for thepurposespecied.

6. An internal combustion-engine of the four-cycle type comprising acylinder having inlet and exhaust ports, a. piston having passagesextending lengthwise thereof and communicating continuously with saidports respectively throughout the stroke of said piston, said passageshaving lateral .extensions in the head of said piston, a valve mountedto revolve on the head of said piston over y said extensions and havingya port arranged to communicate successively With said passages throughsaid extensions,.a connecting rod for said piston,'and a step by stepmeans actuated by the'rocking of said rod for moving said valve.

. 7. Anjmternal combustion engine of the four cycle type comprising acylinder having inlet and exhaust ports, a piston having y longitudinalpassages arranged to communicate with said ports, said assages havinglateral extensions in the-hea of said piston,

anda Wall separating one vextension from the other extension of saidpassages, a valve mounted to revolve on said piston over said extensionsand having a iport arranged to communicate successively with saidpassages ,through said extensions, a connecting rod for said piston, andmeans actuated by the rocking of said rod for revolving said valve.

8. lAn internal combustion engine comprising a cylinder having inlet andexhaust ports, a piston having passages therein communicatingrespeetivelyvvith said ports, a valve mounted to revolve on the head ofsaid piston and-having a 'port arranged to cmmunicate successively Withsaid passages, a

' connectingrod for said piston, said valve having proJections thereonarranged in pairs upon opposite sides .of its axis, the projections ofone pair beinga greater distance from said axis than the projections ofthe other pair, and means actuated by the rocking ofsaid connecting rodand engaging said projections to revolve said valve.

9j., An internal combustion engine comprising a cylinder having inletand exhaust ports, a piston provided With passageways openingcommunication betWen said respective ports and theinterior of thecylinder in A front of said piston, a valve mounted to revolve on thehead of said piston and having a port, and means actuated by the rockingof said connecting rod with each cycle of operation of the engine tobring said valve port into position to successivelyopen and close saidinlet'and exhaust ports.

` 10; A11 internal combustion engine ofthe four-cycle type comprising acylinder having inlet and exhaust ports, a piston having passagestherein communicating continuously With said portsrespectivelythroughout the stroke of said piston and a valve having aport arranged to register successively With7 said inlet and exhaustports, and means actuated by the rocking of said connecting rod foroperating said valve.` v -In Witness whereof, I have hereunto set myhand` this 9th day of December, 1912. ROBERT W. MUlR. --Witnessesa H.l?. Gm,

GEO. R. RELSEY.

